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(a) The superposition of the CP MAS 13C NMR spectra of the original untreated lignin (sample S0) and the products obtained by the reaction lignin + TEP + NH3 at 180 °C (sample S2); and (b) the superposition of the CP MAS 13C NMR spectra of the products obtained by the reaction of lignin + TEP + NH3 (sample S2) and lignin + TEP (sample S1), both at 180 °C.
